25542972281 has 2 divisors, whose sum is σ = 25542972282. Its totient is φ = 25542972280.

The previous prime is 25542972241. The next prime is 25542972293. The reversal of 25542972281 is 18227924552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13119640681 + 12423331600 = 114541^2 + 111460^2 .

It is a cyclic number.

It is not a de Polignac number, because 25542972281 - 2¹⁴ = 25542955897 is a prime.

It is a super-2 number, since 2×25542972281² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25542972241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12771486140 + 12771486141.

It is an arithmetic number, because the mean of its divisors is an integer number (12771486141).

Almost surely, 2^25542972281 is an apocalyptic number.

It is an amenable number.

25542972281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25542972281 is an equidigital number, since it uses as much as digits as its factorization.

25542972281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 47.

The spelling of 25542972281 in words is "twenty-five billion, five hundred forty-two million, nine hundred seventy-two thousand, two hundred eighty-one".